X Lists are a great way to keep up with accounts you care about on X (formerly Twitter). The advantage of X Lists is you get to choose select accounts to see posts from instead of drowning in thousands of tweets on your typical timeline. And you don't need to follow the account to add it to your List.
How to See What X (Twitter) Lists You're On (and How to Remove Yourself)
X lists can be useful, but it's useful to check which ones you're on and remove yourself from the lists you don't want to be included on.